body {
  max-height: auto;
}




button {
  display: block;
  margin: 24px auto;
  font-size: 1.2rem;
  height: 48px;
  line-height: 1.2rem;
  padding: 0 36px;
}
#result-area {
  margin: 4% 0;
  padding-top: 12px;
  width: 100%;
  height: 8rem;
  font-size: 7rem;
  font-weight: bolder;
  display: flex;
  justify-content: center; 
  align-items: center; 
  background-color: black;
  color: yellow;
}
.history-area {
  margin: 4% 0;
  width: 100%;
  box-sizing: border-box;
  border: solid 1px gray;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  background-color: #EEFFFF;
}
.history-area p {
  background-color: darkgreen;
  color: white;
  font-weight: bold;
  text-align: center;
  font-size: 1.6rem;
  line-height: 1.8rem;
}

#history-area li {
  width: 100%;
  padding: 0 2%;
  display: grid;
  grid-template-columns: 10% 90%;
  grid-gap: 0 2%;
  
}
.history-area li.history-list:nth-child(odd) {
  background-color: #EEFFEE;
}

.history-list {
  
  text-align: center;
}

.history-list ul li{
  border: solid 1px gray;
  border-radius: 8px;
  font-weight: bold;
  margin: 4px 8px;
  padding-top: 2px;
  font-size: 1.5rem;
  line-height: 1.5rem;
}